Unfortunately, I ran out my favorite rice when shooting this video and got whatever I could at a local Asian Market. If you want a really great rice try to find new crop Koshihikari. Here are some options on amazon:

You can keep it at room temperature for up to 4 hours. There is no way to refrigerate it without terrible quality loss. I hear some people freeze it. If you google for "freezing sushi rice" you'll get some info, though I've never tried that.